You may be interested in this seemingly related bug report:
http://bugs.python.org/issue26601
[Neil Schemenauer <n...@python.ca>]
> I was running Python 2.4.11 under strace and I noticed some odd
> looking system calls:
>
> mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x7f9848681000
> munmap(0x7f9848681000, 262144) = 0
> mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x7f9848681000
> munmap(0x7f9848681000, 262144) = 0
> [... repeated a number of times ...]
>
> Looking at obmalloc.c, there doesn't seem to be any high/low
> watermark (hysteresis) associated with unallocating arenas. Is that
> true? If so, does it seem prudent to implement something to avoid
> this behavior? It seems potentially expensive if you program is
> running just at the threshold of needing another arena.
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